Allow Permission Request to only require a ToolCallUpdate instead of a full tool call (#36319)

Release Notes:

- N/A

crates/agent_servers/src/acp/v1.rs

@@ -233,7 +233,7 @@ impl acp::Client for ClientDelegate {
                 thread.request_tool_call_authorization(arguments.tool_call, arguments.options, cx)
             })?;
 
-        let result = rx.await;
+        let result = rx?.await;
 
         let outcome = match result {
             Ok(option) => acp::RequestPermissionOutcome::Selected { option_id: option },